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I downloaded a sample version and have a question about trying to trap a notification from a CTreeCtrl.

In the child view class the variable is declared as CExtWFF<CTreeCtrl> m_view and it’s created as:    

m_view.Create(WS_CHILD|WS_VISIBLE|WS_VSCROLL|WS_HSCROLL|WS_TABSTOP
             |TVS_HASBUTTONS|TVS_HASLINES|TVS_LINESATROOT
             |TVS_INFOTIP|TVS_DISABLEDRAGDROP
             |TVS_SINGLEEXPAND|TVS_SHOWSELALWAYS,
             CRect(0,0,0,0), this, UINT(IDC_VIEW)) )

I then setup a notify message map: ON_NOTIFY(NM_DBLCLK, IDC_VIEW, OnTreeDblClick)

However i never was able to trap the message of a double click on the tree. What am I missing here?

The CExtWFF template class eliminates flickering of the tree control. It does not affect the mouse input. We need to take a look at your project because your tree creation code and message map entry do not have any errors.